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Reports iterations over the <code>keySet()</code> of a <code>java.util.Map</code> instance,
where the iterated keys are used to retrieve the values from the map.
<p>
  Such iteration may be more efficient when replaced with an iteration over the
  <code>entrySet()</code> or <code>values()</code> (if the key is not actually used).
</p>
<p>
  Similarly, <code>keySet().forEach(key -&gt; ...)</code>
  can be replaced with <code>forEach((key, value) -&gt; ...)</code> if values are retrieved
  inside a lambda.
</p>
<p><b>Example:</b></p>
<pre><code>
  for (Object key : map.keySet()) {
   Object val = map.get(key);
  }
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  for (Object val : map.values()) {}
</code></pre>
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